INDEX. 



351 



Sheep-tick-, 204. 



Shell of moUusca, 210. 



Shell, money, 223. 



Ship-worm, 216. 



Shrew mice, 297. 



Shrimp, fresh-water, 190. 



Shrimp, opossum, 31, 32, 83. 



Shrimps, 191. 



Silk-worm, 205. 



Sinistral univalves, 224, 225, 



227. _ 

 Sinupallialia, 215. 

 Siphoniata, 212, 214. 

 Siphonophora, 160, 162. 

 Siphonostomatous shells, 222, 



223, 224. 

 Siphons, 212. 

 Siphuncle, 228. 

 Skate, 250, 253, 254. 

 Skeleton of sponge, 146, 147. 

 Skeleton of vertebrates, 242. 

 Skeletons, 333. 

 Skull, 242. 

 Snail, River-, 221. 

 Snails, 210, 219, 225. 

 Snakes, -269, 271. 

 Social caterpillars, 206. 

 Sole, 257, 258. 

 Somites, xix, 244. 

 Sparrow, 276. 

 Spatangidss, 176. 

 Species, 49, 121, 122. 

 Specimens, dealers in, 830. 

 Spencei-, Herbert, 61. 

 Spermatozoa, 67, 144. 

 Sperm-cell, 67. 

 Spicules of sponge, 146, 147. 

 Spiders, 194. • 

 Spinal cord, 35, 76, 113. 

 Spindle-shell,- 224, 225. 

 Spinnerets,- 194. 

 Sponge, 145. 

 Spontaneous- generation:, 96. 



"Spores" of Protozoa, xix, 



137, 140. 

 Spores of plants, 66, 154. 

 Spring-tails, 200. 

 Spring-flies, 200, 203. 

 Squid, 230. 

 Starch, 8, 38. 

 Star-fishes, 168, 172-174. 

 Statoblast, 231. 

 Steganophthalmata, 166. 

 Sternum, 242. 

 Stigmata, 199. 

 Stomach, 36. 

 Stomodseum, 36. 

 Stone-lilies, 168, 170. 

 Strobila, 164. 



Struggle for existence, 51, 114. 

 Sturgeon, 256. 

 Suocu.s entericus, 38. 

 Sugar, 8, 38. 



Survival ot the fittest, 51, 114. 

 Sun-star, 173. 

 Swammerdam, 103. 

 Symbiosis, 136. 

 Symmetry, 81. 

 Sj'ncytium, xix, 70. 



Tadpole, 73, 264. 



Tails, 85. 



Tape-worm, 181. 



Taste-buds, 33. 



Teeth of mammalia, 284-287. 



Teeth, primitive form of, 254, 



255. 

 Teeth, succession of, 254, 255, 

 Teleostei (or Bony Pishes), 



256. 

 Tentacles, 148. 

 Tenuirostres, 276. 

 Termites (plural of Termes), 



203. 

 Tetrabranchiata, 226. 



